Think of you in isolation. How long could you exist without the world. In a vacuum…? How separate are you really?
Or think about your sense impressions. Where do you experience sounds? Or sights? Listen to bird song for example. Where is it experienced? Listen to your own voice. What’s the difference? Where do you see a tree or your hand? What’s the difference? Really? And why?
Everything just appears and all in the same ‘space’. In the center of the non-onion.